Clutch device.



PATENTED APR. 18 1905.

0. PINARD. GLUTGH DEVICE."

APPLIUATION FILED D110. 23, 1902.

' INVENTOR ATTORNEYS UNITED STATES CLAUDE PINARD, OF CHALON-SUR-SACNE, FRANCE, ASSIGNOR TO THE Patented April 18, 1905.

PATENT OFFICE.

FIRM OF COMPAGNIE INTERNATIONALE DE LELECTRO-TYPOGRAPHE MERAY ET ROZAR, OF PARIS, FRANCE.

CLUTCH DEVICE- SPEGIFIGATION forming part of Letters Patent N0. 787,788, dated April 18, 1905.

Application filed December 23,1902. Serial Nol36,3'77- To all whom, it may concern:

Be it known that I, CLAUDE PINARD, engineer, a citizen of the French Republic, residing at Chalon-sur-Sane, Department of 5 Sane-et-Loire, Republic of France, have invented a certain new and useful Clutch Device, of which the following is a full, clear, and exact description, and for which I have applied for Letters Patent in France, dated June 11, I 9 1 902; in Russia November 9; in Germany November 18; in Italy November 19; in Austria November 21; in Hungary November 22; in Portugal November 25, and in Great Britain December 3.

The object of this invention is to provide an automatic clutch which will prevent a shaft from being rotated by any means except the proper driving means from which it should derive motion.

In the accompanying drawings, Figure 1 is a longitudinal sectional view of my improved clutch mechanism. Fig. 2 is a transverse section at right angles thereto, and Fig. 3 is a plan view with parts broken away.

The dotted lines U, Fig. 1, represent the crank or fly wheel (actuated from any source of power) keyed onto a flanged bushing and easing V on the shaft S, which turns in a stationary bearing T, provided with a drum fric- 3 tion-surface. A second flanged bushing s is keyed onto the shaft S, its flange having an elongated slot engaged by a stud i: in the flange of the bushing V. The stud has a limited motion in the arc of the slot.

3 Two helices C and C of large cross-section at one end and of small cross-section at their other ends are placed so as to surround the forces the helix No. I to the leftfree of the drum and maintains it thus free so long as the stud presses against the limiting-wall of the slot. The helix No. II is drawn along, tending if friction occur between it and the drum to back up and free itself of the drum. In the opposite direction of rotation the same is true; but the functions of the respective helices are reversed.

Should one attempt to move the shaft S in either direction, (say clockwise, Fig. 2,) the helix No. II will be pushed free of the drum; but the helix No. I will be dragged along the surface of the drum, to which it will cling as would a whip-lash, because of its peculiar varying cross section and because of the spring .R, which tends to hold one end back.

- The helix which so operates to clutch the drum varies according to the direction of motion endeavored to be imparted to the shaft S. It will thus be seen that the clutch prevents movements of the shaft by power exerted upon the shaft itself, but does not prevent rotation of the shaft by its proper operating means which acts upon the shaft through the helices.

I claim as my invention A rotating shaft, 2. flxed concentric bearing therefor, a casing adapted to turn to a limited extent on said shaft, and means for revolving the casing and shaft, a bushing s keyed to the shaft, a pair of helices having flexible ends, and a spring connecting them, their other ends being Secured to the bushing s, and to this specification in the presence of two suba stlud in 1E)the casing adapted to move one 05 scribing Witnesses. saic flexi 1c en s, whereby one 1e ix is cause to disengage the bearing during the limited (JLAUDE PINARD' 5 motion herein referred to in advance of the Witnesses:

motion of theshaft. GUs'rAv'E DUMONT,

In testimony whereof I have signed my name EDWARD P. MAOLEAN, 

